Conveners
C3OrD - 4K Cryocoolers
- Zhihua Gan (Zhejiang University)
- Chao Wang (Cryomech, Inc.)
Mingyao Xu
(Sumitomo Heavy Industries, Ltd.)
01/07/2015, 11:00
CEC-03 - Cryocoolers (Non-Aerospace)
Contributed Oral Presentation
A novel GM cycle, called as asymmetric GM cycle is proposed. In an asymmetric GM cycle, the displacer moves slowly when it is close to the upper dead point, but moves rapidly when it is close to the lower dead point. Therefore, the expansion process is longer, while the discharging process is shorter than that in a conventional GM cycle. Meanwhile, the duration of the charging process can be...
Dr
Xihuan Hao
(Advanced Research Systems, Inc.)
01/07/2015, 11:15
CEC-03 - Cryocoolers (Non-Aerospace)
Contributed Oral Presentation
High cooling power 4.2 K stage cryocoolers are in high demand, given their broad applications in such fields as magnetic resonance imaging (MRI) and low temperature superconductors. ARS has recently designed and developed a high cooling power 4.2 K stage pneumatic-drive G-M cryocooler which achieves a typical cooling power of 1.8 W/4.2 K. Steady input power of our newly developed helium...
Qian Bao
(Sumitomo Heavy Industries, Ltd.)
01/07/2015, 11:30
CEC-03 - Cryocoolers (Non-Aerospace)
Contributed Oral Presentation
To meet the growing demand for compact cooling solution required by superconducting electronic devices, we developed a two-stage 2K GM cryocooler with cryostat system which can provide 0.1 W / 20 mW cooling power at 45 K / 2.3 K for first and second stage under no-load condition. Nevertheless, with several innovative technologies applied, the total length of expander cylinder is shortened to...
471.
Cool-down acceleration for G-M cryocoolers with thermal oscillations passively damped by helium
Robert Webber
(Hypres, Inc.)
01/07/2015, 11:45
CEC-03 - Cryocoolers (Non-Aerospace)
Contributed Oral Presentation
4 K Gifford-McMahon cryocoolers suffer from inherent temperature oscillations which can be a problem for certain attached electronic instrumentation; Sumitomo Heavy Industries has exploited the high volumetric specific heat of super-critical He to quell these oscillations (approx. 10 dB) by strongly thermally linking a separate vessel of He to the second stage; no significant thermal...
Mr
Xiaogang Lin
(Sumitomo Heavy Industries,Ltd.)
01/07/2015, 12:00
CEC-03 - Cryocoolers (Non-Aerospace)
Contributed Oral Presentation
A high-capacity 4K two-stage pulse tube cryocooler (PTC) with a remote valve unit that produces cooling capacity of 1.5 W at 4.2 K and 36 W at 45 K simultaneously has been under development at Sumitomo Heavy Industries, Ltd. (SHI). The PTC can be used for dilution cryocoolers, magnet cooling and other cryogenic devices. Compared to the SHI 1W commercial PTC Model RP-082B2S, the cooling...
